30/05/2026
🌿 BOSHERSTON LILY PONDS: THE MAN-MADE WONDER THAT BECAME ONE OF PEMBROKESHIRE’S WILDEST TREASURES 🌿
If Pembrokeshire had a secret garden, Bosherston Lily Ponds would be very close to it.
Tucked within the Stackpole Estate in south Pembrokeshire, the Lily Ponds look so natural that many visitors assume they have always been there. Calm water, wooded valley sides, lilies floating like little white stars, dragonflies patrolling the reeds, and the golden pull of Broad Haven South just beyond.
But here is the twist.
Bosherston Lily Ponds are not natural ponds at all.
They are a grand piece of landscape design. A Georgian-era estate project. A bit of aristocratic showing off, if we are being honest. The sort of thing that says: “Yes, we have a big house, but have you seen our artificially flooded limestone valleys?” Very subtle. Very Pembrokeshire Downton Abbey.
Over time, though, this carefully designed estate feature became something far more important. Today, the Lily Ponds are part of a National Nature Reserve, a Site of Special Scientific Interest, and an internationally recognised Special Area of Conservation. In other words, what began as a grand backdrop for a mansion has become one of Wales’ most important freshwater wildlife habitats.
Not bad for a posh landscaping job.
🌊 WHAT ARE THE BOSHERSTON LILY PONDS?
Bosherston Lily Ponds are a linked system of shallow freshwater lakes within the National Trust’s Stackpole Estate, near Bosherston village and Broad Haven South beach.
They are sometimes called Bosherston Lakes, Stackpole Lakes, or simply “the Lily Ponds”. Locally, everyone knows what you mean. It is one of those places where “just going for a walk” can accidentally turn into three hours of staring at water lilies and pretending you came for the exercise.
The ponds are made up of several arms of water lying within old limestone valleys. Paths and causeways cross the lakes, giving visitors those famous views across the water, reeds, woodland, and lilies.
At one end, the route leads down towards Broad Haven South, where the freshwater world of the ponds gives way to dunes, sand, cliffs, and sea. It is one of the great Pembrokeshire landscape switches: peaceful lily pond one minute, dramatic beach scene the next.
🏛️ BEFORE THE PONDS: A VALLEY, STREAMS, WETLAND AND TIDAL WATER
Before the lakes were created, this was not a neat ornamental pond system.
The area was made up of narrow limestone valleys with streams running through them. The water eventually flowed towards the coast, where the valley system met the sea near Broad Haven South. Parts of the lower valley were influenced by tidal conditions, marsh, dune systems, wet woodland, and swampy ground.
The geology matters here. Stackpole sits on Carboniferous limestone, which helps shape the cliffs, valleys, clear water, calcium-rich springs, and plant life. This is not just a pretty place. The landscape is doing a lot of heavy lifting behind the scenes, like a very old Welsh stage crew.
The water feeding the lakes comes partly from streams and partly from calcium-rich springs. That lime-rich water is one of the reasons the ponds became so special for rare aquatic plants.
So before the Campbells of Cawdor got involved, nature had already provided the raw ingredients: valleys, springs, woodland, marsh, limestone, and a route to the sea.
Then came the estate planners.
👑 THE STACKPOLE ESTATE AND THE CAWDOR FAMILY
The story of Bosherston Lily Ponds is tied to the story of Stackpole Court, once one of the great houses of Pembrokeshire.
The Stackpole Estate passed into Campbell hands when Elizabeth Lort, heiress to the estate, married Alexander Campbell of Cawdor in 1689. The Campbells later built an early Georgian mansion at Stackpole Court in the 1730s, replacing earlier fortified buildings on the site.
The big landscape transformation came after Sir John Campbell II inherited the estate in 1777. Like many wealthy landowners of the period, he set about reshaping the land around the mansion into a designed landscape.
This was the age of “improved” estates, where landowners wanted sweeping views, ornamental water, planted woodlands, carefully framed walks, bridges, and dramatic scenery. Nature, but with a waistcoat and a drawing room.
At Stackpole, that meant flooding parts of the valley system to create lakes as part of a grand ornamental landscape. Thousands of trees were planted, paths were laid out, and the lakes became a key feature of the view from the estate.
The ponds were not originally created as a nature reserve. They were created to look impressive.
Mission accomplished, to be fair.
🛠️ HOW WERE THE LILY PONDS CREATED?
The ponds were formed by damming and flooding three limestone valleys.
This did not happen in one neat afternoon with a shovel and a can-do attitude. The lake system developed in stages, from the late 18th century into the mid-19th century.
The first major landscaping works began in the late 1700s, around the period after Sir John Campbell II inherited Stackpole in 1777. The final dam near the sea was not completed until 1860.
The result was a controlled freshwater lake system separated from the sea by dunes and dams. At very high tides, the sea level can actually be higher than the lakes behind the dam, which gives you an idea of how carefully the site had to be managed.
The lakes were designed with causeways, bridges, paths and views. They were part of the theatre of Stackpole Court. Visitors and residents could walk through woodland, cross water, look back towards the house, and enjoy the sort of landscape that looked natural but was actually highly choreographed.
Basically, Georgian Instagram. No filters, just 200 years of tree planting.
🏚️ WHAT HAPPENED TO STACKPOLE COURT?
Here is the strange thing: the mansion that helped inspire this landscape is gone.
Stackpole Court declined badly during the 20th century. Part of the wider estate was requisitioned by the Ministry of Defence in 1938 to form Castlemartin Range. During wartime use, the mansion suffered damage and neglect, including the removal of lead from the roof, which allowed rot to take hold.
The house was eventually demolished in 1963.
So today, visitors walk through a landscape designed to complement a grand house that no longer exists. That gives Bosherston and Stackpole an unusually ghostly charm. The ponds, bridges, woodlands, terraces and estate routes remain, but the main architectural star has vanished.
It is like visiting a stage set after the lead actor has stormed off.
🌸 WHY ARE THERE SO MANY LILIES?
The famous white water lilies are the headline act.
In early summer, especially June and July, the surface of the ponds can be covered with white water lilies. They grow particularly well in the western and central arms of the lake system, where the conditions suit them.
The lilies are not just pretty. They are part of a wider freshwater plant community that makes Bosherston so important.
The lakes are shallow, calcium-rich, and spring-fed. This allows rare aquatic plants to thrive, including stoneworts, especially bristly stonewort. Stoneworts are not exactly celebrity plants, but ecologically they are a big deal. They form underwater beds and help define the special character of these marl lakes.
Marl lakes are calcium-rich water bodies with distinctive plant communities. Bosherston is one of the best examples in Wales.
So yes, go for the lilies. But spare a little respect for the stoneworts. They have terrible PR but excellent ecological credentials.
🌱 THE FLORA: MORE THAN JUST LILIES
The Lily Ponds are part of a much wider habitat mosaic across Stackpole.
Within and around the water, you can find:
White water lily
Bristly stonewort and other stonewort species
Curled pondweed
Fennel pondweed
Spiked water-milfoil
Canadian waterweed
Common reed
Bulrush
Common spike-rush
Branched bur-reed
Greater pond-sedge
Around the ponds, woodland and wet margins support a rich mix of plants. The estate also includes dunes, grassland, scrub, coastal cliffs and maritime habitats, which means the plant life changes quickly as you move from lake to beach to cliff.
In spring, the woodland comes alive with primroses, wild garlic and early purple orchids. Around the dunes and grassland, there are spring squill, cowslips, bee orchids, pyramidal orchids, common spotted orchids and wild thyme. Along the coast, thrift and golden samphire add colour to the cliffs.
That is one of Stackpole’s great strengths. It is not one habitat. It is many habitats stitched together.
Freshwater lakes. Wet woodland. Mixed woodland. Reedbed. Dunes. Limestone cliffs. Coastal grassland. Sandy beach. Scrub. Old estate planting.
Pembrokeshire showing off again, frankly.
🦦 OTTERS: THE STARS OF STACKPOLE
Bosherston is one of the best-known otter sites in Wales.
The lakes support a healthy otter population. They feed on eels, pike, perch, roach and tench found in the lake system. Otters are shy, so seeing one is never guaranteed, but patient and quiet visitors do sometimes get lucky.
Early morning and evening are often the best times to watch for wildlife, though it is important to keep distance and avoid disturbing animals. The otters are not paid actors and do not perform on demand. Rude, but fair.
🐦 BIRDS OF THE PONDS AND REEDS
The Lily Ponds are excellent for birdlife all year round.
Around the reedbeds and marshy edges, look for:
Coot
Moorhen
Mute swan
Heron
Kingfisher
Little grebe
Reed warbler
Sedge warbler
Water rail
In winter, the lakes can attract wildfowl such as goosander, gadwall and goldeneye. Bitterns may also be present in winter, though they are famously elusive. A bittern is basically a reedbed with opinions.
Above the water in summer, swallows and house martins skim the surface for insects.
Move towards the coast and the bird life changes again. The cliffs and short coastal turf support chough, ravens, peregrine falcons, razorbills, guillemots and other seabirds. The wider Stackpole area is a brilliant example of how freshwater, woodland and coastal habitats can sit almost on top of one another.
🦇 BATS: A SITE OF INTERNATIONAL IMPORTANCE
Stackpole is not only about lilies and otters.
The wider protected area is also important for bats, especially the greater horseshoe bat. The Pembrokeshire Bat Sites and Bosherston Lakes Special Area of Conservation supports a significant proportion of the UK greater horseshoe bat population.
Greater horseshoe bats use old buildings, trees, sheltered valleys and feeding areas across the landscape. Stackpole provides exactly the mix they need: roosting sites, woodland edges, pasture, insects, and sheltered commuting routes.
The National Trust notes that Stackpole is home to the largest colony of greater horseshoe bats in Wales, and one of the largest concentrations in Britain.
So while the lilies get the postcards, the bats are quietly running the night shift.
🦋 DRAGONFLIES, BUTTERFLIES AND INSECTS
Dragonflies and damselflies are a major part of the Bosherston experience from spring into autumn.
More than 20 species of dragonfly and damselfly have been recorded around the Lily Ponds and Mere Pool Valley. On warm days, they can be seen darting over open water, patrolling reed edges, and resting on waterside plants like tiny winged helicopters.
The wider Stackpole Estate is also excellent for butterflies. At least 30 species are commonly found in the area, supported by flower-rich grassland, dunes, woodland edges and coastal habitats. Species to look for include common blue, silver-studded blue, silver-washed fritillary, dark green fritillary and brown argus.
It is a place that rewards slow walking. The faster you march, the more you miss.
🐍 REPTILES AND OTHER WILDLIFE
The Stackpole landscape also supports reptiles including grass snake, adder and slow worm.
The mix of sunny grassland, scrub edges, dunes and wetland makes it suitable for a range of smaller animals that visitors may never see but which are vital to the food chain.
The ponds themselves contain fish including pike, perch, roach, tench and eels. These are important prey for otters and birds.
Even the less glamorous species matter. The reeds, pondweed, snails, insects, fish, amphibians and plant communities all help keep the system alive. Nature is not a collection of cute animals. It is a messy team sport.
🏖️ THE LINK TO BROAD HAVEN SOUTH
One of the best things about Bosherston is that the walk can lead directly to Broad Haven South.
The transition is spectacular. You move from enclosed, wooded freshwater lakes to open dunes, beach, cliffs and sea. Broad Haven South is known for its wide sandy beach and the distinctive offshore rock known as Church Rock.
Behind the beach lies Mere Pool Valley, another important area for wetland plants and insects. This is a good place for dragonflies and damselflies, and it adds another layer to the already rich Stackpole habitat network.
The dunes also matter. They separate the freshwater lake system from the sea and are part of the reason the ponds have survived as a freshwater habitat rather than reverting to tidal influence.
🌉 THE BRIDGES, CAUSEWAYS AND DESIGNED VIEWS
The Lily Ponds are not only a nature site. They are also a historic designed landscape.
The causeways and bridges are part of the old estate layout. They were built to help people move through the landscape and appreciate carefully planned views across the water, woodland and towards Stackpole Court.
The eight-arch bridge is one of the most recognisable features. From there, visitors can head towards Broad Haven South, the bird hide in the old boathouse, or back through the estate.
This is what makes Bosherston so interesting. It is both wild and artificial. A landscape designed by people, then reclaimed and enriched by nature.
It is Pembrokeshire doing that classic thing of refusing to fit neatly into one box.
⚠️ MODERN CHALLENGES: SILT, ALGAE AND CLIMATE PRESSURE
The ponds may look timeless, but they need active care.
Over time, silt has built up in parts of the lake system, especially the upper eastern arm. This reduces open water and encourages the spread of certain plants. Climate change is adding pressure too, with lower summer water levels, risk of blue-green algae, winter flooding, and more sediment entering the system during heavy rain.
The National Trust has been working on the Stackpole Lakes Project, looking at long-term solutions. This includes catchment management, possible selective sediment removal, access improvements, and better understanding of the historic landscape.
In plain English: the ponds are beautiful, but they are not self-maintaining.
A landscape like this needs care, funding, science, practical conservation, and visitors who respect it. No pressure, then.
🚶 VISITING BOSHERSTON LILY PONDS
Bosherston Lily Ponds can be accessed from the Bosherston car park, with trails leading down to the water and around the lake system.
The classic route takes in the western arm, central causeway, Grassy Bridge, reedbeds, Broad Haven South, and the return route towards Bosherston. There are also routes from Stackpole Court and Stackpole Quay.
The Pembrokeshire Coast National Park describes one walk as around 3 miles, with uneven surfaces, gradients, ponds, beach views and some steep sections. The National Trust also promotes a shorter Lily Ponds trail of about 1 mile.
Best time for lilies: June and July
Best time for dragonflies: spring to early autumn
Best time for wildflowers: spring and summer
Best time for otters: anytime, but early or late in the day gives you a better chance
Best time for peace and quiet: not the middle of a sunny school holiday afternoon, unless you enjoy queueing behind Labradors
Please keep dogs under control, stay on paths, avoid disturbing wildlife, and do not pick plants. The lilies look much better where they are, and the ducks are already judging us enough.
🌍 WHY BOSHERSTON MATTERS
Bosherston Lily Ponds matter because they are many things at once.
They are a beauty spot.
They are a historic estate landscape.
They are a man-made lake system.
They are a rare freshwater habitat.
They are part of a National Nature Reserve.
They are internationally important for conservation.
They are a home for otters, bats, birds, lilies, stoneworts, orchids, dragonflies and countless smaller species.
They are one of the great Pembrokeshire walks.
They also remind us that landscapes change.
What began as an ornamental feature for a grand mansion has become a place where nature has taken the leading role. The house has gone. The family estate has changed. The old social order that built the landscape has disappeared. But the lakes remain, full of life.
That is the magic of Bosherston Lily Ponds.
They are not untouched wilderness. They are something stranger and more interesting: a human-made landscape that nature turned into a masterpiece.
And honestly, that is very Pembrokeshire.
A bit dramatic. A bit wild. A bit posh in places. Absolutely beautiful.
